import numpy as np

dt = np.dtype([("age", np.int64)])
print(dt)

a = np.arange(8).reshape(2, 2, 2)
b = np.swapaxes(a, 1, 0)
print(b)

print()
a = np.array([[5, 6], [7, 8]])
b = np.array([[1, 2], [3, 4]])
c = np.concatenate((a, b), axis=1)
print(c)
